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Special Forums UNIX and Linux Applications High Performance Computing Newbie question about using a Cluster: using memory Post 302310048 by joespr on Thursday 23rd of April 2009 02:30:51 PM
Old 04-23-2009
Question Newbie question about using a Cluster: using memory

Newbie question about clusters and memory.

Is there a way using a cluster (or any other Linux feature/technology) where I can link up a bunch of PCs such that an app thinks it has more memory than available on just one local machine?

For example, we have multiple surplus PCs with 512MB RAM (which is the max that that hw supports). Is there a way to cluster or link them up in some way such that an app would think that it has more than the 512MB RAM available, say 1GB or anything else?

I am fully aware that the speed in such a hypothetical situation would be less than ideal, but speed is not the primary concern at the moment. The primary concern is available memory.

I (think I) know how to link up machines such that disk space on several PCs could be available to an app such that the disk space for the app exceeds the available space on the local machine. But is there a way to do this with memory... using cluster or any other Linux feature or technology?

Thanks for your replies (and don't beat me up too much if this is an insane question, I'm just a newbie :-) ).
 

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mkqdisk(8)						      Quorum Disk Management							mkqdisk(8)

NAME
mkqdisk - Cluster Quorum Disk Utility WARNING
Use of this command can cause the cluster to malfunction. SYNOPSIS
mkqdisk [-?|-h] | [-L] | [-f label] [-c device -l label] [-d [-d ...]] DESCRIPTION
The mkqdisk command is used to create a new quorum disk or display existing quorum disks accessible from a given cluster node. OPTIONS
-c device -l label Initialize a new cluster quorum disk. This will destroy all data on the given device. If a cluster is currently using that device as a quorum disk, the entire cluster will malfunction. Do not run this on an active cluster when qdiskd is running. Only one device on the SAN should ever have the given label; using multiple different devices is currently not supported (it is expected a RAID array is used for quorum disk redundancy). The label can be any textual string up to 127 characters - and is therefore enough space to hold a UUID created with uuidgen(1). -f label Find the cluster quorum disk with the given label and display information about it. -L Display information on all accessible cluster quorum disks. -d Increase debugging level. Specify multiple times for more information. Currently, specifying more than twice has no effect. SEE ALSO
qdisk(5), qdiskd(8), uuidgen(1) July 2006 mkqdisk(8)
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